diff --git a/lib/src/ctrl.c b/lib/src/ctrl.c
index 7621ab5..332af2a 100644
--- a/lib/src/ctrl.c
+++ b/lib/src/ctrl.c
@@ -35,6 +35,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
+#include <netinet/in.h>
 #endif
 
 #define SESSION_OSTYPE "Win10.0.0"
diff --git a/lib/src/senkusha.c b/lib/src/senkusha.c
index 2cba4ac..abfa937 100644
--- a/lib/src/senkusha.c
+++ b/lib/src/senkusha.c
@@ -36,6 +36,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
+#include <netinet/in.h>
 #endif
 
 
diff --git a/lib/src/takion.c b/lib/src/takion.c
index dcbf89b..117167e 100644
--- a/lib/src/takion.c
+++ b/lib/src/takion.c
@@ -30,7 +30,9 @@
 #include <ws2tcpip.h>
 #else
 #include <unistd.h>
+#include <netinet/in.h>
 #include <netinet/ip.h>
+#include <sys/socket.h>
 #endif
 
 
@@ -253,9 +255,12 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_connect(ChiakiTakion *takion, Chiaki
 #if defined(_WIN32)
 		const DWORD dontfragment_val = 1;
 		r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAGMENT, (const void *)&dontfragment_val, sizeof(dontfragment_val));
+#elif defined(__FreeBSD__)
+		const int dontfrag_val = 1;
+		r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAG, (const void *)&dontfrag_val, sizeof(dontfrag_val));
 #else
 		const int mtu_discover_val = IP_PMTUDISC_DO;
-		r = setsockopt(takion->sock, IPPROTO_IP, IP_MTU_DISCOVER, (const void *) &mtu_discover_val, sizeof(mtu_discover_val));
+		r = setsockopt(takion->sock, IPPROTO_IP, IP_MTU_DISCOVER, (const void *)&mtu_discover_val, sizeof(mtu_discover_val));
 #endif
 		if(r < 0)
 		{
diff --git a/lib/src/utils.h b/lib/src/utils.h
index 27b3de8..a4bbfc1 100644
--- a/lib/src/utils.h
+++ b/lib/src/utils.h
@@ -24,6 +24,7 @@
 #else
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <sys/socket.h>
 #endif
 
 #include <stdint.h>